None of those sensors are in my old car. But I've seen the ads. Every one has a disclaimer that none of them replaces the key safety sensor - which is the nut behind the steering wheel.
Exactly. In this case, both nuts behind both steering wheels were careless. Tom should not even have parked where he did; he should have been in the part of the parking lot that doesn’t have the traffic from the drive-through. The other driver could have stopped if he had been alert and going an appropriate speed.